She teases him the entire drive there

This wasn't the first time that Tom had driven Sarah to work, though obviously that was different now that they shared a workplace.

This was the first time that she had stuck her hand in his pants as he drove. "Sarah, w-what are you doing?" he cried, feeling her perfectly manicured finger rub up and down the length of his hardening cock through his underwear.

He kept his eyes on the road, and so only heard the playful smile in her voice. "Oh, I'm just making sure you're having a pleasant morning, Professor Saunders." She kept running her finger up and down, up and down, until Tom was rock hard. "Hmm...we're only a ten minute drive from the school...I wonder if you can keep yourself from staining your clothes?"

Shuddering in pleasure at the thought, at the way that Sarah was taking so much joy in teasing him, Tom did his best to keep an eye on the road. Even with a finger became a hand, holding him. Stroking him. Moving inside. Cupping his balls. Squeezing his cock.

Precum had started to wet her hand and leak into his underwear when they finally started to approach the parking lot, and in seconds Sarah's hand was out of his clothes and being wiped with a clean wipe from her purse. "Good boy~" she told him with a purr. "Guess you're not as perverted as I thought, professor."

All he could do was nod at that, taking a moment to think of the unsexiest things he could think of until his cock quieted down and he could get out of the car without embarrassing himself. "See you at lunch?" he asked, since they didn't share any classes.

"We'll meet up then, if I have the time, but I'll be sure to keep you entertained until then~"